322 lines
9.0 KiB
Rust
322 lines
9.0 KiB
Rust
extern crate regex;
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use std::io::prelude::*;
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use std::{io, fs, env, fmt};
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use std::collections::{HashSet, BTreeMap};
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use std::fmt::Display;
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use regex::Regex;
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macro_rules! warn {
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($($arg:tt)*) => {{
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extern crate std;
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use std::io::prelude::*;
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let _ = writeln!(&mut std::io::stderr(), $($arg)*);
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}};
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}
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macro_rules! die {
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($($arg:tt)*) => {{
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extern crate std;
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warn!($($arg)*);
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std::process::exit(-1)
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}};
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}
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trait Slurp {
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fn slurp(&mut self) -> Result<String, std::io::Error>;
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}
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impl Slurp for fs::File {
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fn slurp(&mut self) -> Result<String, std::io::Error> {
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let mut destination = String::new();
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try!(self.read_to_string(&mut destination));
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Ok(destination)
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}
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}
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fn re(pattern: &str) -> Regex {
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Regex::new(pattern).unwrap()
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}
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struct Recipe<'a> {
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line: usize,
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name: &'a str,
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leading_whitespace: &'a str,
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commands: Vec<&'a str>,
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dependencies: HashSet<&'a str>,
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}
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struct Error<'a> {
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text: &'a str,
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line: usize,
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kind: ErrorKind<'a>
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}
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enum ErrorKind<'a> {
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CircularDependency{circle: Vec<&'a str>},
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DuplicateDependency{name: &'a str},
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DuplicateRecipe{first: usize, name: &'a str},
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InconsistentLeadingWhitespace{expected: &'a str, found: &'a str},
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Shebang,
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UnknownDependency{name: &'a str, unknown: &'a str},
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Unparsable,
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UnparsableDependencies,
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}
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fn error<'a>(text: &'a str, line: usize, kind: ErrorKind<'a>)
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-> Error<'a>
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{
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Error {
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text: text,
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line: line,
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kind: kind,
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}
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}
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fn show_whitespace(text: &str) -> String {
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text.chars().map(|c| match c { '\t' => 't', ' ' => 's', _ => c }).collect()
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}
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impl<'a> Display for Error<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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try!(write!(f, "justfile:{}: ", self.line));
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match self.kind {
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ErrorKind::CircularDependency{ref circle} => {
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try!(write!(f, "circular dependency: {}", circle.join(" -> ")));
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return Ok(());
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}
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ErrorKind::DuplicateDependency{name} => {
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try!(writeln!(f, "duplicate dependency: {}", name));
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}
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ErrorKind::DuplicateRecipe{first, name} => {
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try!(write!(f, "duplicate recipe: {} appears on lines {} and {}",
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name, first, self.line));
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return Ok(());
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}
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ErrorKind::InconsistentLeadingWhitespace{expected, found} => {
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try!(writeln!(f,
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"inconsistant leading whitespace: recipe started with {} but found line with {}:",
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show_whitespace(expected), show_whitespace(found)
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));
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}
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ErrorKind::Shebang => {
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try!(writeln!(f, "shebang \"#!\" is reserved syntax"))
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}
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ErrorKind::UnknownDependency{name, unknown} => {
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try!(writeln!(f, "recipe {} has unknown dependency {}", name, unknown));
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}
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ErrorKind::Unparsable => {
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try!(writeln!(f, "could not parse line:"));
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}
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ErrorKind::UnparsableDependencies => {
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try!(writeln!(f, "could not parse dependencies:"));
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}
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}
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match self.text.lines().nth(self.line) {
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Some(line) => try!(write!(f, "{}", line)),
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None => die!("internal error: Error has invalid line number: {}", self.line),
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}
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Ok(())
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}
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}
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struct Justfile<'a> {
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_recipes: BTreeMap<&'a str, Recipe<'a>>
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}
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fn parse<'a>(text: &'a str) -> Result<Justfile, Error> {
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let shebang_re = re(r"^\s*#!(.*)$");
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let comment_re = re(r"^\s*#[^!].*$");
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let command_re = re(r"^(\s+).*$");
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let blank_re = re(r"^\s*$");
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let label_re = re(r"^([a-z](-[a-z]|[a-z])*):(.*)$");
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let name_re = re(r"^[a-z](-[a-z]|[a-z])*$");
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let whitespace_re = re(r"\s+");
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let mut recipes: BTreeMap<&'a str, Recipe<'a>> = BTreeMap::new();
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let mut current_recipe: Option<Recipe> = None;
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for (i, line) in text.lines().enumerate() {
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if blank_re.is_match(line) {
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continue;
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} else if shebang_re.is_match(line) {
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return Err(error(text, i, ErrorKind::Shebang));
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}
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if let Some(mut recipe) = current_recipe {
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match command_re.captures(line) {
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Some(captures) => {
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let leading_whitespace = captures.at(1).unwrap();
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if recipe.leading_whitespace == "" {
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recipe.leading_whitespace = leading_whitespace;
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} else if !line.starts_with(recipe.leading_whitespace) {
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return Err(error(text, i, ErrorKind::InconsistentLeadingWhitespace{
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expected: recipe.leading_whitespace,
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found: leading_whitespace,
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}));
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}
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recipe.commands.push(line.split_at(recipe.leading_whitespace.len()).1);
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current_recipe = Some(recipe);
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continue;
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},
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None => {
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recipes.insert(recipe.name, recipe);
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current_recipe = None;
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},
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}
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}
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if comment_re.is_match(line) {
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// ignore
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} else if let Some(captures) = label_re.captures(line) {
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let name = captures.at(1).unwrap();
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if let Some(recipe) = recipes.get(name) {
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return Err(error(text, i, ErrorKind::DuplicateRecipe {
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first: recipe.line,
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name: name,
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}));
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}
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let rest = captures.at(3).unwrap().trim();
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let mut dependencies = HashSet::new();
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for part in whitespace_re.split(rest) {
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if name_re.is_match(part) {
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if dependencies.contains(part) {
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return Err(error(text, i, ErrorKind::DuplicateDependency{
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name: part,
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}));
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}
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dependencies.insert(part);
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} else {
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return Err(error(text, i, ErrorKind::UnparsableDependencies));
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}
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}
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current_recipe = Some(Recipe{
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line: i,
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name: name,
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leading_whitespace: "",
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commands: vec![],
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dependencies: dependencies,
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});
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} else {
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return Err(error(text, i, ErrorKind::Unparsable));
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}
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}
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if let Some(recipe) = current_recipe {
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recipes.insert(recipe.name, recipe);
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}
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let mut resolved = HashSet::new();
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let mut seen = HashSet::new();
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let mut stack = vec![];
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fn resolve<'a>(
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text: &'a str,
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recipes: &BTreeMap<&str, Recipe<'a>>,
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resolved: &mut HashSet<&'a str>,
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seen: &mut HashSet<&'a str>,
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stack: &mut Vec<&'a str>,
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recipe: &Recipe<'a>,
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) -> Result<(), Error<'a>> {
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stack.push(recipe.name);
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seen.insert(recipe.name);
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for dependency_name in &recipe.dependencies {
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match recipes.get(dependency_name) {
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Some(dependency) => if !resolved.contains(dependency.name) {
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if seen.contains(dependency.name) {
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let first = stack[0];
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stack.push(first);
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return Err(error(text, recipe.line, ErrorKind::CircularDependency {
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circle: stack.iter()
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.skip_while(|name| **name != dependency.name)
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.cloned().collect()
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}));
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}
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return resolve(text, recipes, resolved, seen, stack, dependency);
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},
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None => return Err(error(text, recipe.line, ErrorKind::UnknownDependency {
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name: recipe.name,
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unknown: dependency_name
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})),
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}
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}
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resolved.insert(recipe.name);
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stack.pop();
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Ok(())
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}
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for (_, ref recipe) in &recipes {
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try!(resolve(text, &recipes, &mut resolved, &mut seen, &mut stack, &recipe));
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}
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Ok(Justfile{_recipes: recipes})
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}
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fn main() {
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loop {
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match fs::metadata("justfile") {
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Ok(metadata) => if metadata.is_file() { break; },
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Err(error) => {
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if error.kind() != io::ErrorKind::NotFound {
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die!("Error fetching justfile metadata: {}", error)
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}
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}
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}
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match env::current_dir() {
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Ok(pathbuf) => if pathbuf.as_os_str() == "/" { die!("No justfile found."); },
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Err(error) => die!("Error getting current dir: {}", error),
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}
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if let Err(error) = env::set_current_dir("..") {
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die!("Error changing directory: {}", error);
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}
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}
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let text = fs::File::open("justfile")
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.unwrap_or_else(|error| die!("Error opening justfile: {}", error))
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.slurp()
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.unwrap_or_else(|error| die!("Error reading justfile: {}", error));
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let _justfile = parse(&text).unwrap_or_else(|error| die!("{}", error));
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/*
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// let requests: Vec<String> = std::env::args().skip(1).collect();
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// for request in requests {
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// println!("{}", request);
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// }
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// let arguments: Vec<String> = std::env::args().skip(1 + recipes.len() + 1).collect();
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// for (i, argument) in arguments.into_iter().enumerate() {
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// std::env::set_var(format!("ARG{}", i), argument);
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// }
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let mut command = std::process::Command::new(make.command());
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command.arg("MAKEFLAGS=");
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if make.gnu() {
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command.arg("--always-make").arg("--no-print-directory");
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}
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command.arg("-f").arg("justfile");
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for recipe in recipes {
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command.arg(recipe);
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}
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match command.status() {
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Err(error) => die!("Failed to execute `{:?}`: {}", command, error),
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Ok(exit_status) => match exit_status.code() {
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Some(code) => std::process::exit(code),
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None => std::process::exit(-1),
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}
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}
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*/
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}
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